Gun-barrel-polishing machine.



C.-H. HEMMING.

GUN BARREL POLISHING MACHINE. APPLICATION FILED MAY 19, 19mg.

1,237,037. PatentdA11g.14, 1917.

5 SHEETS-SHEET I.

WITNESSES: S J

C. H. HEMMJNGI GUN BARREL POLISHING MAQHJNL APPLICATION HLEDMAY 19' 1916.

M \S\ S S 7 .3 ,0, v w w v Patent-edAug. 14, 1917.

WITN SSES:

INVENTOR m'z yaw Q ATTORNEY C. Hz HEMMING.

GUN BARREL POLISHING MACHINE.

WH'ICKTION FILED MAY 19, 1916.

1,237,037 v V PatentdAug. 14,1917

5 SHEETS-SHEET 3.

WITNESSES: INVENTOR ypa. 04M gizm A'T'TORNEY' c. H. HEMMI'NG.-

GUN BARREL POLISHING MACHINE.

APPLICATION FILE-D MAY19,I916.

1 ,237,037 I I Patnted Aug". 14, 1917.

SSHEETS-SHEET 4- I WITNESSES: I lNVENT OR c. H. H EMMING.

GUN BARREL POLISHING MACHINE. APPLICATION FILED MAY 19, 1916.

up s'rarns PATENT onro CARL H. HEMMING, OF NEW HAVEN, CONNECTICUT.

GUN-BARREL-POLIS HING MACHINE.

To all whom it may concern: 1

Be it known that I, CARL H. HEMMING, citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Grun- Barrel-Polishin Machines; and I do hereby declare the Following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to polishing machines, and is particularly adapted and specially designed for polishing gun barrels and other like tapered articles.

Referring to the drawings:

Figure 1 represents a front elevation of the machine and broken view of the belt connected with the driving shaft Fig. 2 is an upper plan view of the machine;

Fig. 3 is an end elevation of the machine looking in the direction of arrow a, Fig. 1;

Fig. 4 is an end elevation of the machine looking in the direction of arrow 6, Fig. 1;

Fig. 5 is an enlarged view of the barrel support, front elevation of the polishing wheel, and broken view of certain mechanical members and parts of the support;

Fig. 6 is an enlarged broken detail view of the upper rail of the barrel support, and en larged detail view of its supporting brackets therefor;

Fig. 7 is an enlarged detail view of one of the supporting brackets, and sectional view of the top rail of the barrel support therein;

Fig. 8 is an enlarged detail view of the trip lever, sectional view of the horizontal arm of the tilting lever on line 8, Fig. 4, roll carrying member pivotedly supported thereto, and the inclined block with which the roll contacts to raise said horizontal arm;

Fig. 9 is an enlarged view of one of the barrel supporting heads, broken view of its supporting bar, and broken view of one of the uprights of the barrel support; and

Fig..10 is an enlarged detail rear elevation of the sprocket wheel, hollow shaft, and sliding bolt as part of the mechanism adapted for rotating the barrel holding spindles.

1 is the bed of the machine, 2 and 3 uprights for supporting mechanism, presently to be described.

The barrel support and the mechanism connected therewith is shown more clearly in Specification of Letters Patent.

Patented Aug. 14., 1917.

Application filed May 19, 1916. Serial No. 98,503.

Figs. 1 and 5, particularly the latter. The support comprises the upper rail 4, the uprights 5-6, barrel supporting heads 78, and the bar 9 on which the heads are adjustably mounted. In these views, the upright 5 is shown attached to the head 7, and the upright .6 to the head 8. In practice, the

upright 5 will be attached to the block 10, Fig. 9, so that the head 7 can be adjusted on the bar 9 for, different length of barrels. The breech of the barrel 11 is securedin the chuck 12 adjustably mounted on the threaded end 13 of the rotatable spindle 14 mounted in the head 8. The muzzle end'of the barrel is mounted on the end of the rod 15, which rod has a longitudinal movement through the spindle 16 by means of the rod 15 pivoted to the handle lever 17, and is also rotatably connected to said spindle.

The polishing wheel 18 is mounted, Fig.1,

on the shaft 19 journaled in the heads 20 of the bracket 21 whose base 22 is mounted to slide on the machine bed to adjust the position of the polishing wheel with respect to the gun barrel, and is adjusted by means of the hand wheel 23, and screw 24. The polishing wheel shaft is driven from a source of power-not shown-through the medium of the belt 25, Fig. 2, on the tight pulley 26. 27 is the loose pulley, and 28 is the shipper rod carrying the fingers 29, Fig. 1.

30, Figs. 1, 3, 4 and 5, is a presser bar or foot carrying at its lower end the wooden V-block 31, Figs. 3 and 4, adapted to hold the barrel against the polishing wheel under spring tension, as follows: The presser foot is pivotally supported on the rod 32 pro-' jecting through the lug 33 secured to the vertical bars 34. The upper end of the presser foot embraces the rod 35, supported to the tilting block 36, located between the bars 34. 37 is a spring on rod 35, located betweenthe head 38 of said rod and the presser foot and adapted thereby to exert a flexible pressure of the V-block 31 toward the polishing wheel. I

The presser foot carrier consists of the bars 34 secured to the block 39 pivotally supported on the pin 40 projecting through several separate elements are shown as com prising the presser foot carrier, they could readily be confined to one single element.

46, Fig. 2, is a traveling carriage carrying the V-slide 47 and trolleys 48; the former traveling in the V groove or way 49 of the stationary bar 50-see also Figs. 3 and 4and the latter traveling on the rib 51 of the machine frame 52.

53, Figs. 3, 4 and 8, is a trip lever pivotally supported to the projection 54 of the bracket 42, and it carries the lug 55. 56 is a bracket pivotally supported on the arm 43 carrying the roller 57, and 58 is a taper faced block adjustably mounted on the slide 47 of the carriage adapted, when brought in contact with the roller, Fig. 8, to lift the horizontal arm 43 of the presser foot carrier and permit the lug of the trip lever 53 to drop under said arm through the action of the spring 59, Figs. 2 and 4. The elevation of this arm will swing the vertical arm of said carrier toward the polishing wheel, and the V-block 31 of the presser foot against the gun barrel. The arm 60 is adjustably mounted on the slide 47 and carries the trip pin 61, which pin, at the completion of the polishing, will trip the lever 53 and release the arm 43 and cause the presser foot 30 to be carried away from the gun barrel by means of the spring 45, as before mentioned.

Referring to Figs. 1 and-5, -62 and'63 are arms depending from the traveling carriage and forming a part thereof. Said arms carry the brackets 64 and 65, which brackets have the elongated slots 66, Fig. 7, which embrace the upper rail 4 of the swinging barrel support.

The purpose of these elongated slots is to give free lateral movement to the swing ing-barrel supportsee dotted lines, Fig. 6- so that the flexible pressure exerted by the presser foot 30 will be equal throughout the entire length of the tapered gun barrel. In other words, the barrelsupport is enabled to assume an angular position corresponding to the taper of the barrel.

67 and '68 are collars-adjustably mounted on the rail 4, the former adapted to be engaged by the bracket to carry the barrel support with the carriage during the polishingoperation, and the latter is engaged by the bracket 64 to return said support.

The pulley 69, on the polishing wheel shaft, Fig. 1, carries the belt 70 to transmit motion. to the ack shaft 71, jour'naled in the hangers 72, through the medium of the large pulley 7 3. The small pulley 74 onthis shaft transmits motion through the medium of the belt 75-see also Figs. 2 and 3and the pulley 76' to-t-he driving shaft 77, which shaft runs-continuously with the polishing wheel-shaft and is journaled in the brackets 78 projecting from the machine frame.

The carriage 46 is actuated to travel in either direction through the medium of the rotatable screw shaft 80 as follows: 81, Figs. 1 and 2, is a traveling nut mounted on the screw shaft and is connected to the carriage 46 by the stud 82. 83 is a gear, having the clutch face 84, journaled on the threadless portion, of the screw shaft, and runs cont-nuously with the driving shaft 77 through the medium of the'pinion 85, on said shaft, and the intermediate speed change gears 8687 mounted on studs 8889 of the shifting handle lever 90.

Gear 91 is provided with the clutch face 92 and is also journaled on the screw shaft, and it runs continuously with the driving shaft 7 7 by means of the gear 93 and the intermediate gear 94 journaled 0n the handle lever 94. 95 is a grooved double face clutch collar rotatably' fixed on the screw shaft and longitudinally movable thereon, and is longitudinally actuated by the forked clutch lever 96, Figs. 1 and 2, to bring the clutch collar into engagement with either of the clutch faces of the gears 83 and 91.

The sliding clutch rod 97, Figs. 1 and 5, is mounted in the bracket 98 and also in the upright 2. The forked end 99 of this rod is pivotally connected to the clutch lever 96 by pin 100. This rod carries the adjustable collars 101-402 adapted to be engaged by the traveling nut 81 for actuating the rod in either direction.

103see also Fig. 4-is a lever pivotally supported to the machine frame whose inner forked end 104, Figs. 1, 2 and 5, engages the grooved collar 105 on the rod 97, and the outer forked end 106 of said lever engages the grooved collar 107 on the driving shaft 7 7. Said collar is adapted to slide on said shaft and rotate with the same, and is provided on its outer face with the clutch pins 108 adapted to contact with the clutch pins 109 on the inner face of the collar 110 fixed on the end of the short shaft 111 journaled in the bracket 112.

On the outer end of the short shaft 111 is located the pinion 113 meshing with the gear 114, Figs. 2 and 4, journaled on the stud 115, projecting from the hand lever 116. 117 is a sprocket wheel secured to the outer face of the gear 114-located within the casing 118and is connected by the chain 119 to the sprocket wheel 120 on the end of the shaft 121. ournaled in the boxes 122, Fig. 2.

On the opposite end of shaft 121 is mounted a sprocket wheel-not shownwhich is connected to the sprocket wheel 123, Fig. 3, by the chain 124. This sprocket whee1 see also Fig. 10is mounted on the hollow shaft 125 journaled in the boX 126 at the lower end of the casing 127. 128 is a bolt located within this hollow shaft and adapted to have a free longitudinal movement therein and also a rotary movement with the hollow shaft through the medium of the key 129.

180, Figs. 1 and 5, is a flexible belt connecting the sliding bolt 128 with the spindle 14 mounted in the head 8 of the barrel support, and is adapted thereby to transmit rotary motion from the spindle 125 to the spindle 14, and thus impart rotary motion to the barrel 11. The frictional contact of the muzzle of the barrel with the rod 15 will also cause the spindle 16 to rotate in sympathy with the spindle 14, and prevent marring the muzzle by means of its engagement with the rod 15.

The purpose of the sliding bolt 128 is to avoid stretching or otherwise distorting the flexible belt when the barrel support is swung away from the polishing wheel. In other words, when said support swings out ward, the bolt will be drawn out to compensate for this outward swing of the frame and thereby relieve the flexible belt of all strain.

The radial movement of the barrel support is effected simultaneously with the radial movement of the presser foot carrier, as follows: 181, Figs. 1, 4 and 5, is a block mounted on the rod 82, and it carries the rod 182 Whose hook end 188, Fig. 4, embraces the rod 184, secured to the uprights 5 and 6 of the barrel support, so that, when the presser foot carrier is swung outward, said support is carried with it.

The operation is as follows: Depressing the treadle 185, Fig. 1, will actuate the levers 186 and 187 to throw the forked lever 188 to the left which will throw the clutch lever 96, pivoted on the stud 189, tothe right to bring the clutch collar 95, Fig. 2, into engagement with the clutch face 84 of the gear 88. This will cause the screw shaft 80 to rotate and start the carriage 46 for ward in the direction of arrow 0.

When the clutch lever 96 is thus actuated, it will actuate the rod 97, Fig. 5, in the same direction and bring the clutch collar 107, on shaft 77, Fig. 2, into engagement with clutch pins 109 of the collar 110, and start the rotation of the gun barrel, in the manner previously described.

As soon as the carriage is inmotion, it will bring the inclined block 58, Fig. 8, in contact with the roller 57 and elevate the arm 48 of the presser foot carrier to allow the lug 55 to drop under said arm andhold it in such elevated position during the polishing operation. The elevation of said arm will, as perviously mentioned, carry the presser foot 80 toward the polishing wheel. The barrel support will also travel with the carriage by means of the engagement of the bracket 65, Fig. 5, with the collar 67, as before described. The barrel support will gradually swing laterally-see dotted lines,

Fig. 6and thus follow the taper of the barrel so that the pressure of the presser foot 80 against the barrel will be uniform throughout its entire length, as before mentioned.

At the completion of the polishing operation, the nut 81 will contact with the collar 102 and carry the rod 97 to the left, throw the clutch lever 9.6 in the opposite direction to bring the clutch collar 95, Fig. 2, into engagement with the clutch face 92 of the gear 91 for a quick return of the carriage. Actuating the rod 97 for this reverse movement will also disengage the clutch collar 107 and stop the rotation of the gun barrel. As soon, however, as the gun barrel has been carried across the face of the polishing wheel, the trip rod 61, Figs. 1 and 2, will contact with the trip lever 58 and release the arm 48 to bring it under the influence of the spring 45 to throw the presser foot 80 away from the gun barrel before the return movement of the carriage begins, or simultaneously therewith.

The barrel support will also join in the reverse movement of the carriage by means of the engagement of the bracket 64 with the collar 68, as before mentioned. While the carriage is retreating, the operator will have removed the finished barrel and inserted another before the nut 81 contacts with the collar 101, Fig. 5, to actuate the rod and reverse the clutch lever 96 for another forward movement of the carriage. Or, if required, the engagement of the nut 81 with the collar 101, could be timed to bring the clutch lever 96 into a neutral position and said-lever could be actuated by the treadle as before.

As before mentioned, the V block 81, Figs. 8 and 4, is held against the barrel, under spring tension, during the polishing operation, and if permitted to remain stationary,

the polished face of the barrel would have a noticeably spiral finish, and only one portion of the polishing wheel could be'in contact with the barrel. j

To overcome these objectionable features, means are provided whereby the mechanism, connected with the presser foot, is actuated to give an intermittent or continuous movement of the presser foot back and forth across the face of the polishing wheel during the polishing operation, as follows: 140, Fig. 4, is a gib projecting from the outer face of the stationary bar 50 on which the bracket 42 is adapted to slide by means of the following mechanism: 141, Figs. 1 and 2, is a pin wheel rotatably mounted on the stud 142, projecting from the bar '50. 148 is a connecting rod pivotally supported on the pin 144, carried by the pin wheel, and the pin 145 carried by the bracket 42. 146 are a series of dogs pivotally supported on the pins 147 projecting from the face of the bar 148, which bar is secured to the traveling carriage.

As the carriage moves along, .the dogs alternately engage the pin wheel and rotate the same a distance represented by such contact and thus impart a forward sliding movement to the bracket l2. Ihe series of dogs 146 are intended to advance said bracket a distance sufficient to carry the presser bar 30 across the face of the polishing wheel, and when this is done, the stud, 144., of the pin wheel, will occupy a position opposite to that shown, so that, when the series of dogs M9 engage the pin wheel,the movement of the bracket will be reversed to reverse the travel of the presser bar across the face of the polishing wheel. In this manner the presser foot may, if desired, be carried back and forth across the face of the polishing wheel several times before the travel of the carriage 4:6 is reversed, the number of times depending, of course, on the number of forward and reversing series of dogs employed.

When the dogs are engaging the pin wheel, they are braced against the pins 150, and when the carriage is retreating, they will readily swing on their pivotal supports and pass freely over the pin-wheel. In practice, there will be a sufficient number of dogs to impart a continuous rotation to the pin wheel and a continuous travel of the bracket 42, and if an intermittent travel of the bracket is desired, a sulficient number of the dogs are temporarily removed to time the travel of thebracket l'IlKflLCOOI-CliLHCQ' therewith.

As before stated, the machine is capable of polishing tapered surfaces of all articles capable of being supported in the barrel support. When, therefore, the article is not round, the mechanism for rotating the supporting means for the round article could be temporarily suspended if the machine is constructed to polish both kinds of articles.

Minor changes could bemade in the mechan-ism for actuating the barrel support without departing from my invention. It is quite evident that the machine is capable of polishing straight articles, as well as tapered ones, for the presser foot is free to follow straight as well as tapered surfaces. The term presser foot also embraces the V-block, that part that contacts with the gun barrel or other like article to be polished.

Having thus described my invention, what Iclaim is 1. In a machine ofthe character described, a polishing wheel, an automatically swinging support for holding the ends of tapered articles to be polished, mechanism for moving the support across the face of the polishing wheel, apresser foot adapted to main- Lamps? tain a flexible pressure against the article, and means providing a free lateral movement of the support to permit it to automatically assume an angle, coincident with the taper of the article to be polished.

2. Ina machine of the character described, a polishing wheel, a traveling support in which a tapered traveling. gun barrel is rotstablyeupported. at its ends, mechanism for actuating the support to and from the wheel, means whereby the support has a free lateral movement to enable it to automatically assume an angle. oincident with the taper of the barrel, and an independently actuated presser foot adapted to exert a flexible pressure against the barrel and toward the polishing wheel.

3. In a machine vof the character described, a polishing wheel, a gun barrel support comprising heads, a bar on which the heads are adjustably supported, rotatable spindles in said heads adapted tosupport a gun barrel, and a presser foot adapted to exert a flexible pressure against the barrel and toward the polishing wheel.

4. In a machineof the characterdescribed, comprising a polishing wheel, a gun barrel support, a traveling car-riage, said support freely mounted to said carriage and in such a manner that it is allowed thereby a radial movement to and from the polishing wheel, and also a lateral movement to automatically assume an angular position coincident with the taper of the gun barrel.

5. In a machine of the character de scribed, a polishing wheel, a swinging gun barrel support, rotatable spindles mounted therein, a gun barrel connected therewith, a stationary support adjacent to the gun barrel support, a hollow rotatable spindle M in the stationary support, a sliding bolt within the hollow spindle, and means whereby the same is rotated with said hollow spindle, and a flexible shaft connecting the bolt with one of the spindles in the gun bar- M rel support, for the purpose described.

6. In a machine of the character described, a polishing wheel, a gun barrel support, a traveling carriage, said support freely mounted to said carriage and in such a manner that it is allowed a radial movement to and from the polishing wheel and also van automatic lateral and angular move ment corresponding to the taper of the gun barrel, and a presser foot adapted to exert a flexible pressure against the barrel and toward the polishing wheel,

7. In a machine of the character described, a polishing Wheel, a traveling carriage, a gun barrel support suspended therefrom and movable with the carriage and adapted to have a free radial movement to and from the polishing wheel, and also an automatic laterala-nd angular movement to correspond to the taper of the gun barrel.

8. In a machine of the character described, a polishing wheel, a traveling carriage, a gun barrel support suspended therefrom and movable therewith and adapted to have a radial movement to and from the, polishing wheel,'and also a lateral andangular movement to correspond to the taper of the gun barrel, mechanism for rotating the barrel, a pivotally supported presser foot carrier, a presser foot pivotally supported thereto, means for actuating the presser foot toward the polishing wheel, and means for retreating the same at the completion of the polishing operation.

9. In a machine of the character described, a polishing wheel, a traveling carriage, a gun barrel support pivotally supported thereto, a driving shaft, a screw shaft, means for operatively connecting the screw shaft with the carriage, mechanism for actuating the screw shaft from the driving shaft for a forward and reverse travel of the carriage, and mechanism actuated through the medium of the carriage to rotate the gun barrel and halt the rotation of the same.

10. In a machine of the character described, a polishing wheel, a traveling carriage, a gun barrel support suspended therefrom and movable therewith and adapted to have a radial movement to and from the polishing wheel and also an angular. movement to correspond to the taper of the gun barrel, a presser foot carrier, a presser foot pivotally supported thereto and under spring tension, means for actuating the presser foot carrier to bring the presser foot against the gun barrel during the polishing operation, means for actuating the presser foot carrier and gun barrel support away from the gun barrel at the completion'of the polishing operation, and mechanism for rotating the gun barrel.

11. In a machine of the character described, a polishing wheel, a driving shaft, a screw shaft, clutch mechanism mounted thereon, rotatable mechanism operatively connecting the screw shaft with the driving shaft, a carriage operatively connected to the screw shaft, a clutch lever intermediate of the clutch mechanism on the screw shaft,

Copies of this patent may clutch rod to be engaged by the carriage for actuating the barrel rotating mechanism and halting the same.

12. In a machine of the character described, a polishing wheel, a traveling car riage, a gun barrel support connected thereto and movable therewith, a presser foot carrier, a support therefor, and mechanism for actuating the presser foot carrier back and forth across the face of the polishing wheel independently of the travel of the gun barrel holder.

18. In a machine of the character de scribed, a polishing wheel, a traveling carriage, a gun barrel support connected thereto and movable therewith, a presser foot carrier, a spring actuated presser foot pivotally supported thereto and adapted to engage the gun barrel, a support to which the presser foot carrier is pivoted, mechanism connected with the carriage and thepresser foot carrier support whereby said support is actuated to carry the presser foot back and forth across the face of the polishing wheel.

14. In a machine of the character described, a polishing wheel, a traveling carriage, a gun barrel support connected thereto and movable therewith, a presser foot carrier, a support for said carrier, a rotatable member, mounted on a stationary support, means connecting said rotatable member with the presser foot carrier support, pivotally supported dogs, carried by the carriage, for engaging said rotatable member to impart a step by step forward and reverse movement to the presser foot carrier support.

In testimony whereof Iaflix my signature i be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

